if you are traveling______ the customs are really foreign to your own,please do as the romans do.

题目

if you are traveling______ the customs are really foreign to your own,please do as the romans do.
a/ in which
b.where
答案+翻译+原因

答案

选D,这里的where是修饰前面的动词traveling,修饰traveling,后面是个状语从句,in which不可以引导状语从句好像,这句话的意思是,当你在一个对你而言全是外国人的地方旅行时,请一定要入乡随俗.